For actual companies working on air car and jet pack technologies, see:
http://www.moller.com for an air car about to be tested in prototype form. For $5,000 you can reserve a delivery slot when they go into production. This is basically a VTOL airplane; it remains to be seen whether they are able to make it work.
http://www.rocketmaninc.com has a jet pack with two trained pilots available for hire. The pack is not for sale, presumably requiring too much training and risk. Both pilots are stunt men with many skills. One is an accomplished skydiver, which would undoubtedly come in handy if the engine quit in mid-flight. They have some blurry video (requires Java) which shows a number of impressive flights.